Born to Run--For 300 Miles

In the realm of the ultramarathon, 100 miles is routine. But iron man Dean Karnazes is no mere mortal

If you were overserved on your 30th birthday, as was Dean Karnazes, the idea of running 100 miles might have seemed entirely sensible at the time. That night Karnazes decided to run himself sober, and about 30 miles later, he was. Since then, he has dumped the cocktails and extended the mileage, but there's no easy explanation for what compelled him to run 262 miles over 75 hours, which seems to be the farthest anyone has ever gone in one shot; or to run the 199-mile Relay, a 12-man team race, solo.

Karnazes, 42, who now plans to go 300 miles...

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